The Desert RATS Trail Running Festival by UTMB returns to Fruita, Colorado from 9 to 12 April, marking one of the first major stops on the 2026 UTMB World Series calendar in North America. Set against the dramatic backdrop of southwestern Colorado's high desert, the festival offers four distances across three days of racing, drawing a global field of trail runners to some of the most visually striking terrain on the ultrarunning circuit. The event serves as a critical early-season test for athletes targeting summer objectives at UTMB Mont-Blanc and the Western States Endurance Run.
The headline 100K race is the centrepiece of the festival, sending runners through 6,205 feet of elevation gain as they ascend mesas, navigate rocky singletrack, and traverse cliff edges overlooking the Colorado River. The course demands technical proficiency and desert-running experience, with exposed sections and variable footing challenging even seasoned ultrarunners. The 50K offers a more accessible but no less spectacular option, featuring flowing singletrack with 3,639 feet of climbing and expansive desert vistas across undulating trails. For those seeking a shorter challenge, the 21K delivers 1,540 feet of elevation gain through trails that capture the essence of Fruita's landscape, while a 10K rounds out the programme.
The dual-qualification structure adds significant competitive weight to the event. Runners who complete the 100K in under 20 hours earn a qualifier to bid for a coveted spot in the 2027 Western States Endurance Run, one of the most prestigious and oversubscribed ultramarathons in the world. Additionally, all finishers in the 100K, 50K, and 21K earn their UTMB Index and Running Stones that can be applied to the 2027 UTMB World Series Finals lottery. This combination of qualifications makes Desert RATS an essential fixture on the calendar for ambitious trail runners plotting their path to Chamonix or Auburn.
The setting itself is part of the appeal. Fruita sits at the western edge of the Colorado Plateau, where red slickrock buttes rise above the desert floor and the Colorado River carves through deep canyons. The courses take full advantage of this landscape, routing runners along cliff edges with panoramic views that rank among the finest on the global trail running circuit. April temperatures in the high desert typically range from cool mornings to warm afternoons, adding a tactical dimension as athletes must manage hydration and heat exposure across the longer distances.
With the UTMB World Series expanding its North American footprint, Desert RATS has established itself as the premier early-season trail event on the continent. The festival atmosphere extends beyond the racing, with gear exhibitions, athlete talks, and a community of trail runners gathering in Fruita's welcoming small-town environment. As the spring trail season gathers pace, all eyes will be on the red rock desert of Colorado this weekend to see which athletes lay down an early marker for the season ahead.